Make sure to power wash the stucco before painting. Another little tip if you are rolling it, is, to spritz the stucco with your garden hose before rolling on the paint. The water that you lightly spray on the wall will mix with the water in your latex paint, thinning it a little, and this will help it to get in all those nooks and crannies. Apply two coats for best results, but only spritz before the first coat.
Hope this helps.
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